<template>
  <el-container class="home-containter">
      <!-- 头部区域 -->
  <el-header>
      <div>
          <img src="../assets/heima.png" alt="">
          <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
  </el-header>
  <!-- 页面主题区域 -->
  <el-container>
      <!-- 侧边栏 -->
    <el-aside :width="iscollapse ? '64px' : '200px'">
      <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu background-color="#333744" text-color="#fff" active-text-color="#409eff"
         :unique-opened="true" :collapse="iscollapse" :collapse-transition="false"
         :router="true" :default-active="activePath">
      <!-- 一级菜单 -->
      <!--   给每个一级菜单动态绑定index值否则会点击一个同步打开关闭 index只接受字符串item.id是数值,转成字符串后面加''-->
      <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
          <!-- 一级菜单的模板区域 -->
        <template slot="title">
            <!-- 图标 -->
          <i :class="iconsObj[item.id]"></i>
          <!-- 文本 -->
          <span>{{item.authName}}</span>
        </template>
        <!-- 二级菜单 -->
         <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children"
         :key="subItem.id" @click="saveNavState('/' + subItem.path)">
             <template slot="title">
            <!-- 图标 -->
          <i class="el-icon-menu"></i>
          <!-- 文本 -->
          <span>{{subItem.authName}}</span>
        </template>
         </el-menu-item>
      </el-submenu>
    </el-menu>
    </el-aside>
    <!-- 右侧内容 -->
    <el-main>
      <router-view></router-view>
    </el-main>
  </el-container>
</el-container>
</template>

<script>
export default {
  data () {
    return {
      menuList: [],
      iconsObj: {
        125: 'iconfont icon-users',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      iscollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  // 在整个页面刚一加载的时候就应该立即获取左侧菜单
  created () {
    this.getMentList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 保存链接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
    },
    // 获取所有的菜单
    async getMentList () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
      // console.log(res)
    },
    // 点击按钮切换菜单的折叠与展开
    toggleCollapse () {
      this.iscollapse = !this.iscollapse
    }
  }
}
</script>

<style lang="less" scoped>
.home-containter{
    height: 100%;
}
.el-header{
    background-color: #373b41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color:#fff;
    font-size: 20px;
    > div {
        display: flex;
        align-items: center;
        span {
            margin-left: 15px;
        }
    }
}
.el-aside{
    background-color: #333744;
    .el-menu{
      border-right:none;
    }
}
.el-main{
    background-color: #EAEDF1;
}
.toggle-button{
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
